Add iOS buildtest workflow

Author: J1coding

.github/workflows/ios-buildtest-ipa.yml

@@ -0,0 +1,75 @@
+name: iOS Build Test IPA
+
+on:
+  push:
+    branches:
+      - 'buildtest/**'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ios-buildtest-ipa-${{ github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    name: Build unsigned iOS IPA
+    runs-on: macos-15
+    timeout-minutes: 60
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          submodules: recursive
+
+      - name: Toolchain diagnostics
+        run: |
+          sw_vers
+          uname -a
+          xcodebuild -version
+          xcode-select -p
+          cmake --version
+          xcrun --sdk iphoneos --find metal
+          xcrun --sdk iphoneos --find metallib
+          df -h
+
+      - name: Verify submodules
+        run: |
+          git submodule status --recursive
+
+      - name: Generate Xcode project
+        run: |
+          ./scripts/generate-ios-xcode.sh
+
+      - name: List Xcode schemes
+        run: |
+          xcodebuild \
+            -project build-ios-xcode/ARMSX2iOS.xcodeproj \
+            -list
+
+      - name: Build unsigned IPA
+        run: |
+          ./scripts/build-ios-ipa.sh
+
+      - name: Inspect unsigned IPA
+        run: |
+          IPA_PATH="build-ios-xcode/ARMSX2-iOS-unsigned.ipa"
+          if [ ! -f "$IPA_PATH" ]; then
+            echo "Unsigned IPA not produced at $IPA_PATH"
+            find build-ios-xcode -maxdepth 5 \( -name "*.ipa" -o -name "*.app" \) -print
+            exit 1
+          fi
+          ls -lh "$IPA_PATH"
+
+      - name: Upload unsigned IPA
+        uses: actions/upload-artifact@v5
+        with:
+          name: ARMSX2-iOS-buildtest-unsigned-ipa
+          path: build-ios-xcode/ARMSX2-iOS-unsigned.ipa